Whilst I have no strong opinion on the debate at hand one way or another, I would just point out that the music analogy is not particularly relevant here.
With CDs, whether singles or albums, you would have had to pay individually for each and every CD you download.
With TV it is completely different. With the exception of PPV movies or sports (for example) all you pay for is the right to receive the channel on which a show is broadcast. You will pay that regardless of whether you watch a show-then download it, miss it on broadcast-then download or just download.
However, the practice of making a show available online for download is almost certainly illegal, unless that individual has paid for the rights to distribute the show(s) that they make available in this way.
The music analogy also falls apart when you consider the numbers game. In the UK, TV shows have been known to get up to 20 million plus viewers - although generally even the most watched ones tend to come in at 8-12 million.
Compare that to a CD, which is awarded Platinum status after selling just 300,000 units.
A few thousand people here and there downloading a show and not watching the ads is hardly going to dent a successful shows ratings - but a few thousand downloading a CD and not buying it (which many do, let's at least be honest enough to admit that) will definitely impact on sales and revenue.
My guess is that the downloading of TV shows is not going to much bother the PTB for some time to come ...
... and IMO (as someone who already receives their TV "broadcast" through a dedicated broadband connection, complete with a library of movies and schedule-free channels available on demand for a small fee) it won't be too many years before the TV schedule as we know it all but disappears and the bulk of the system moves to an on-demand service.
'tis the digital age, don't you know.